Motor control apparatus

Patent metadata

Field	Value
Publication number	US-2016183389-A1
Application number	US-201514969349-A
Country	US
Kind code	A1
Filing date	Dec 15, 2015
Priority date	Dec 19, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

A motor control apparatus includes a motor, a motor controller, and a connection line. The motor is mounted to a vehicle and has a metal housing. The motor controller is separately provided with the motor, includes a housing and a circuit portion, is connected to the motor through a load line, and drives the motor by a drive current transmitted through the load line. A ground line of the circuit portion is connected to a body of the vehicle as a body earth. The connection line directly connects the metal housing of the motor and the circuit portion of the motor controller without through the housing of the motor controller.

First claim

What is claimed is:

1 . A motor control apparatus comprising:
a motor that is mounted to a vehicle and has a metal housing; a motor controller that includes a housing and a circuit portion, which is disposed in the housing,
is separately provided with the motor,
is connected to the motor through a load line, and
drives the motor by a drive current transmitted through the load line, wherein a ground line of the circuit portion is connected to a body of the vehicle as a body earth; and
a connection line that directly connects the metal housing of the motor and the circuit portion of the motor controller without through the housing of the motor controller.

2 . The motor control apparatus according to claim 1 , wherein:
the motor controller further includes a power source line; and the connection line is connected either one of the power source line or the ground line of the circuit portion in the motor controller.

3 . The motor control apparatus according to claim 1 , wherein:
the connection line is inserted into a cable that includes the load line; and the connection line is connected to the circuit portion of the motor controller through an alternate-current coupling portion that passes an alternate current component and blocks a direct current component.

4 . The motor control apparatus according to claim 3 , wherein;
the connection line is connected to a resistance that is parallel with the alternate-current coupling portion.

5 . The motor control apparatus according to claim 3 , wherein:
the connection line is connected to the ground line of the circuit portion of the motor controller; and the connection line is connected to a Zener diode that is parallel with the alternate-current coupling portion.

6 . The motor control apparatus according to claim 1 , wherein:
the housing of the motor controller is made of metal; and the housing of the motor controller is connected to the body of the vehicle by an other line different from the ground line of the circuit portion of the motor controller.

7 . The motor control apparatus according to claim 1 , wherein:
the connection line is provided by a shield wire of the load line.

8 . The motor control apparatus according to claim 7 , further comprising:
a current detection portion that detects current flowing through the connection line, wherein: when the current detection portion detects a current that is detected at a time the shield wire as the connection line is short circuited with the load line,
the motor controller terminates driving of the motor.

Assignees

• Denso Corp

Inventors

• Toyoda Hirokazu
• Nomura Manabu
• Kondo Yosuke

Classifications

• H02K5/02 Primary

  Casings or enclosures characterised by the material thereof · CPC title

• H05K5/0017 Primary

  with operator interface units · CPC title

• H02H7/0833

  for electric motors with control arrangements · CPC title

• H05K5/0247

  Electrical details of casings, e.g. terminals, passages for cables or wiring · CPC title

• H02P6/32

  Arrangements for controlling wound field motors, e.g. motors with exciter coils · CPC title